Guppy (Poecilia reticulata) - Live tropical fish for sale UK

Poecilia reticulata

Fancy Guppy Blue Moscow Pair (Poecilia reticulata) - UK

Beginner Friendly
Peaceful
£17.42In Stock

Striking Blue Moscow Fancy Guppy pairs with rich colour and strong breeding potential. Ideal for peaceful tropical aquariums. Order now with UK delivery.

Breeding SpeciesCommunity FishGuppyLivebearerModerate CarePeacefulTropical Fish

Care at a Glance

Scientific Name
Poecilia reticulata
Adult Size
6 cm
Lifespan
2 years
Care Level
Easy
Temperament
Peaceful
Temperature
22–28°C
pH Range
6.8–8.5
Hardness
10–30 dGH
Minimum Tank
40L
Diet
Omnivore - flakes, micro pellets, frozen foods, algae

Premium Quality

Healthy, vibrant fish from trusted suppliers

Expert Care

Detailed care guides and support

Live Arrival Guarantee

Your fish arrives healthy or we'll replace it

Acclimated

Properly quarantined and ready for your tank

Quick Care Guide

Temperature
22–28°C
pH Range
6.8–8.5
Minimum Tank
40L
Adult Size
6 cm
Lifespan
2 years
Care Level
Easy
Temperament
Peaceful
Diet
Omnivore - flakes, micro pellets, frozen foods, algae
Water Hardness
10–30 dGH
Tank Region
All

Water Parameters

Maintain these water conditions for optimal health and vibrant colors

Temperature
22–28°C
22°CIdeal Range28°C
pH Level
6.8–8.5
6.8Ideal Range8.5
Water Hardness
10–30 dGH
10 dGHIdeal Range30 dGH

Why Choose This Fish?

Striking Blue Moscow Fancy Guppy pairs with rich colour and strong breeding potential. Ideal for peaceful tropical aquariums. Order now with UK delivery.

The Fancy Guppy is one of the most rewarding fish you can keep, and this Blue Moscow pair shows exactly why. With a deep metallic blue body, flowing tail, lively personality, and easy-going nature, Poecilia reticulata remains a favourite among keepers looking for colourful aquarium fish UK hobbyists can enjoy without advanced care demands. These guppies come as a male and female pair, making them ideal for aquarists interested in both display and guppy fish breeding. They are peaceful, active, and well suited to a planted community aquarium, especially for anyone researching guppy fish care, fancy guppy tank setup, or the best guppies for community tank options available in the UK.

Blue Moscow strains are especially popular in the world of fancy guppy fish because the colour runs strongly across the body rather than appearing only in the tail. Adults usually reach around 4-6 cm, have a typical guppies lifespan of about 2 years, and do best in hard, alkaline water at 22-28°C. As freshwater tropical fish UK aquariums go, they are among the best choices for beginners, families, and breeders alike. See our detailed photos showing the rich blue sheen, elegant finnage, and the difference between the male and fancy guppy female. If you want a hardy, eye-catching pair that can become the centrepiece of a peaceful livebearer setup, this Blue Moscow pair is an excellent choice.

🔹 Quick Facts

  • Scientific Name: Poecilia reticulata
  • Care Level: Easy to moderate
  • Min Tank Size: 40 litres (about 9 gallons)
  • Temperature: 22-28°C (72-82°F)
  • pH Range: 6.8-8.5
  • Lifespan: Up to 2 years, sometimes longer with excellent care
  • Temperament: Peaceful, active, social
  • Diet: Omnivore

Classification

  • Order: Cyprinodontiformes
  • Family: Poeciliidae
  • Genus: Poecilia

Poecilia reticulata is the classic guppy species in the aquarium hobby. It belongs to the livebearer family, which also includes mollies, platies, swordtails, and Poecilia wingei. If you have seen the term poecilia reticulata pronunciation discussed online, it is usually said as “pee-SILL-ee-uh reh-tik-yoo-LAH-tuh.” Blue Moscow guppies are a selectively bred strain developed for strong body colour, elegant finnage, and reliable breeding performance, making them popular among hobbyists who enjoy both display fish and line breeding.

Where Do Blue Moscow Fancy Guppies Come From? Natural Habitat Explained

Wild guppy fish originate from Trinidad, Venezuela, Guyana, and parts of Brazil, where they inhabit streams, drainage channels, ponds, and slow-moving waters. In nature, Poecilia reticulata often lives in warm, mineral-rich water with plenty of plant cover and access to microscopic foods, algae, insect larvae, and organic matter. That natural adaptability is one reason guppies became such a widespread and successful aquarium fish.

The Blue Moscow variety is not a wild form but a selectively bred line within the broader world of guppy fish types and fancy guppy fish types. Compared with a fancy guppy vs wild guppy comparison, this strain has heavier colour saturation, more refined finnage, and a more ornamental body shape. While some hobbyists also keep Poecilia wingei or look into an endler fancy guppy hybrid, true Blue Moscow guppies are valued for their solid blue body and classic show-style appearance.

Because guppies have been introduced to many warm regions, you may also see searches about poecilia reticulata invasive. In the hobby, though, responsible fishkeeping means never releasing aquarium fish into local waterways. Their natural conditions help us understand what they need in captivity: stable warmth, clean water, moderate hardness, and dense planting. If you are reading peces guppy informacion, pez guppy caracteristicas, or poecilia reticulata ficha guides, you will notice the same pattern again and again: they thrive when the tank offers both open swimming space and fine-leaved cover.

For UK aquarists, that makes this pair a superb option among tropical livebearers UK keepers enjoy. They adapt well to home aquariums, especially when given stable conditions rather than frequent swings in temperature or pH. In a planted setup, the fish show stronger colour, more confident behaviour, and better fry survival.

💡 Expert Tip

Mimicking the natural habitat of guppies does not mean making the tank look wild and messy. In practice, it means warm, clean, mineral-rich water, gentle planting, and regular feeding with varied foods. Blue Moscow guppies often show their best body colour when kept over dark substrate with green plants and consistent water chemistry.

How Do You Set Up the Perfect Tank for Blue Moscow Guppies?

A thoughtful fancy guppy tank setup makes a huge difference to colour, health, and breeding success. Although this pair can live in a 40 litre aquarium, a 60 litre or larger tank is a better long-term choice, especially if you expect fry. Many customers specifically ask whether guppy poecilia ret in pairs blue moscow guppies (1 male + female) in 60 litre tank works well, and the answer is yes. A 60 litre planted aquarium gives enough swimming room, allows stable water quality, and leaves space for future offspring.

Tank Size Requirements

The minimum is 40 litres, but 54-60 litres is more forgiving for beginners. Guppies are active, produce regular waste, and breed readily, so small tanks can become crowded fast. If you are planning fancy guppy breeding or keeping them with other community fish UK species, choose more space from the start. This is especially important for anyone wanting a hardy guppy poecilia ret in pairs blue moscow guppies (1 male + female) for new tank setup that remains easy to manage after the first few months.

Water Parameters

These fish do best at 22-28°C, pH 6.8-8.5, and hardness 10-30 dGH. Unlike some soft-water species, guppies generally prefer harder, more alkaline water. Stable parameters matter more than chasing a single exact number. For anyone searching guppy poecilia ret in pairs blue moscow guppies (1 male + female) water parameters or guppy poecilia ret in pairs blue moscow guppies (1 male + female) temperature, aim for 24-26°C in a home aquarium for a good balance of activity, digestion, and longevity.

40L+
Minimum tank
22-28°C
Temperature
6.8-8.5
pH
10-30 dGH
Hardness

Filtration

Use a gentle but efficient filter. Guppies dislike being blasted around by strong current, but they benefit from excellent oxygenation and biological filtration. A sponge filter works well in breeding tanks, while a compact internal filter suits display aquariums. If you are building a complete setup, pair them with a reliable aquarium filter collection choice sized for at least the full tank volume. Keep flow moderate and use plants or decor to break up stronger output.

Substrate

Blue Moscow guppies look best over dark sand or fine gravel because the contrast makes the metallic blue body stand out. A natural, smooth substrate is also easier to keep clean than very coarse gravel. In breeding tanks, bare-bottom setups help with fry management, but for display tanks a dark substrate gives a more polished result.

Plants & Decor

These fish appreciate planting, especially floating plants and fine-leaved species where fry can hide. Java moss, guppy grass, hornwort, water sprite, and anubias are all useful. Customers often ask whether guppy poecilia ret in pairs blue moscow guppies (1 male + female) aquarium plants compatible is a concern; in practice, guppies are among the easiest fish to combine with live plants. They are also excellent guppy poecilia ret in pairs blue moscow guppies (1 male + female) for planted aquarium residents because they add movement without uprooting stems.

If you enjoy comparing strains, you can build a colourful livebearer display around this pair and related varieties such as the Guppy Dumbo Ear Dragon Breeding Beautiful, Guppy German Sunset Male, GUPPY YELLOW TUXEDO MALE - Stunning, or Green Moscow Guppy Male Lovely Fish. These pair especially well in well-planted hard-water aquariums.

Lighting

Moderate lighting for 6-8 hours daily is ideal. Strong light can enhance plant growth and make the blue sheen pop, but too much light without maintenance can encourage algae. A timer helps keep the day-night rhythm stable.

🔹 Quick Setup Checklist

  • Tank size: 40 litres minimum, 60 litres recommended
  • Temperature: 24-26°C for most home setups
  • Water: Hard to moderately hard, stable pH
  • Filter: Gentle flow with strong biological filtration
  • Plants: Use mosses, floating plants, and stem cover
  • Stocking: Keep more females than males if adding extra guppies

💡 Pro Tip

Always cycle the aquarium for 4-6 weeks before adding guppies. A cycled tank is the biggest difference between a smooth start and the common beginner problem of stressed fish, clamped fins, and ammonia spikes.

What Do Blue Moscow Guppies Eat? Complete Feeding Guide

Blue Moscow guppies are omnivores, so a good diet combines quality dry foods with frozen or live supplements. In the wild, Poecilia reticulata feeds on tiny invertebrates, algae, biofilm, and plant matter. In the aquarium, the best approach is variety. If you are searching for fancy guppy food, guppy fish food, or fancy guppy fish food, choose a small-sized staple that suits the fish’s tiny mouth and fast feeding style.

Staple Foods

Use a high-quality micro pellet or fine flake as the daily base. Many keepers like hikari fancy guppy food because it is sized well for adult guppies and supports colour and condition. Searches for hikari fancy guppy and even hikari fancy guppy 1kg usually come from breeders feeding larger groups. For a single pair, a smaller pack is more practical so the food stays fresh.

Supplemental Foods

Offer frozen daphnia, baby brine shrimp, cyclops, and finely crushed bloodworm once or twice a week. These foods help with growth, conditioning, and especially guppy fish breeding. A well-conditioned female guppy produces stronger fry, while the male maintains better finnage and courtship activity.

Treats & Special Foods

For colour and breeding condition, rotate in spirulina-based foods and live baby brine shrimp. This is particularly useful if you are keeping show guppies for sale quality fish or comparing strains such as cobra guppy, red fancy guppy, pink fancy guppy, or Blue Moscow lines. Rich diet variety often improves body fullness and finnage quality.

Feeding Frequency & Portion Control

Feed small amounts 1-2 times per day, only what they finish in about 30-60 seconds. Guppies are enthusiastic eaters and will beg constantly, but overfeeding quickly harms water quality. This matters even more in breeding tanks or small aquariums marketed as guppy poecilia ret in pairs blue moscow guppies (1 male + female) low maintenance fish systems. Low maintenance does not mean no maintenance; it means simple care done consistently.

Time Food Amount
Morning Fine flake or micro pellet Small pinch, eaten within 30-60 seconds
Evening Frozen daphnia, brine shrimp, or quality staple Very small portion

Customers often ask whether one food is enough. The short answer is no. The best Fancy Guppy diet includes a staple plus variety. That is how you support colour, immunity, and fry development.

Browse tropical fish foods for fine flakes, micro pellets, and conditioning foods suited to guppies and other livebearers.

⚠️ Feeding Warning

Overfeeding is one of the fastest ways to create ammonia spikes, cloudy water, and bloating in guppies. Feed lightly, siphon uneaten food, and increase variety rather than quantity.

What Do Blue Moscow Guppies Look Like? Colors, Patterns & Varieties

The Blue Moscow is a standout among fancy guppy fish because the colour is concentrated across the body, not just the tail. A good male shows a rich navy to electric steel-blue sheen, often appearing almost black in lower light and glowing cobalt under brighter lighting. This is why some shoppers compare them with a neon blue guppy or blue neon tux guppy, but the Blue Moscow usually has a heavier, more uniform body colour and a more dramatic silhouette.

Adult males are smaller and more colourful, while the fancy guppy female is larger, rounder, and usually less intensely coloured. Typical fancy guppy size is around 3-4 cm for males and up to 5-6 cm for females, depending on line and feeding. The male’s gonopodium, elongated dorsal, and flowing tail make sexing straightforward. The female often has a visible gravid spot when carrying fry.

Within the hobby, there are many tipos de guppys and colour lines. Blue Moscow sits alongside strains like the fancy tail guppy, pandora guppy, koi forms, tuxedo strains, and dragon-patterned fish. If you want to compare, take a look at the Guppy Poecilia Ret in Pairs Panda for a contrasting black-and-white style or the Guppy Poecilia Ret in Pairs Blue for another blue-toned pairing.

Our photos show the dense blue body tone and finnage shape you should expect from this strain. Colour is usually strongest in mature males kept on dark substrate, fed varied foods, and housed in stable, clean water.

What Fish Can Live With Blue Moscow Guppies? Compatibility Guide

Blue Moscow guppies are classic peaceful aquarium fish UK keepers rely on for mixed tropical tanks. They are active but not aggressive, making them excellent community fish UK residents when paired with species that will not nip fins or outcompete them at feeding time. If you are researching fancy guppy tank mates, think small, calm, and similarly water-compatible.

Ideal Tank Mates

Good companions include other guppies, Endlers, small rasboras, peaceful tetras in suitable water, Corydoras in larger mixed setups, and many snails. Guppies also work well with other livebearers, which is why people often search molly and guppy. This combination can work if the tank is large enough and the water is hard and alkaline, though mollies grow bigger and produce more waste.

For hobbyists building a themed livebearer aquarium, compatible options from our range include the GUPPY FEMALE Lovely Fish if you want to balance male attention, the GUPPY DUMBO EAR DRAGON BREEDING 1 for a more dramatic finnage contrast, and the Green Moscow Guppy Male Lovely Fish if you want a Moscow colour mix. The Guppy German Sunset Male adds warm orange tones, while the GUPPY YELLOW TUXEDO MALE - Stunning gives a brighter, high-contrast look.

Species to Avoid

Avoid fin nippers such as tiger barbs, larger aggressive cichlids, and boisterous fish that stress slow-finned males. Bettas are often asked about under the search fancy guppy and betta. Sometimes it works, but often the long fins and bright colours trigger aggression in one fish or the other, so it is not the safest pairing.

Community Tank Examples

In a 60 litre aquarium, a Blue Moscow pair can live with a small group of extra female guppies and a snail clean-up crew. In a larger 90 litre setup, you could keep a group of guppies with peaceful bottom dwellers and dense planting. If your goal is the best guppy poecilia ret in pairs blue moscow guppies (1 male + female) for community tank layout, focus on calm fish that enjoy similar hard-water conditions.

Invertebrate Compatibility

Adult guppies are generally safe with larger shrimp and snails, but they may eat very small shrimplets. Fine moss and plant cover improve survival. This is one reason planted tanks are so useful for livebearers.

Species Compatible? Notes
Guppy Poecilia Ret in Pairs Panda ✅ Yes Similar care needs and peaceful temperament
GUPPY FEMALE Lovely Fish ✅ Yes Useful for improving male-to-female ratio in breeding groups
Betta splendens ⚠️ Caution May show aggression toward bright, long-finned guppies
Molly ⚠️ Caution Can work in larger hard-water tanks; monitor size difference
Tiger barb ❌ Avoid Likely to nip fins and stress guppies

People comparing shop sources often search fancy guppies petsmart, guppies for sale petsmart, or even guppies for sale craigslist. The real compatibility issue is not where they come from but whether they have been quarantined, sexed correctly, and matched to your water conditions. Healthy guppies settle better and show less stress behaviour in a community tank.

💡 Compatibility Tip

Always quarantine new arrivals for 2-4 weeks before adding them to an established aquarium. Guppies are hardy, but they can still carry parasites or bacterial issues that spread quickly in warm community tanks.

How Do You Breed Blue Moscow Guppies? Complete Breeding Guide

Guppy fish breeding is one of the main reasons aquarists buy a male and female pair. This species is a livebearer, so the female gives birth to free-swimming fry rather than laying eggs. That makes fancy guppy breeding accessible even for beginners, provided you manage stocking and fry survival carefully.

Breeding Setup

A 40-60 litre planted breeding tank works well for one male and two or three females. Although this product is sold as guppy pairs, long-term breeding is easier when the male is not constantly focused on a single female. Add moss, floating plants, and gentle filtration. Warm water around 24-26°C and varied feeding help condition both fish.

Spawning Behaviour

The male will display, flare, and pursue the female regularly. After mating, gestation usually lasts around 21-30 days depending on temperature and condition. A heavily pregnant female fancy guppy becomes fuller in the abdomen and often develops a darker gravid spot. The pez guppy hembra is typically larger and less vividly coloured than the male.

Fry Care & Growth

Newborn fry should be offered infusoria, powdered fry food, or freshly hatched baby brine shrimp. Frequent small feedings and clean water are the keys to fast growth. If left with adults, some fry may be eaten, so dense cover helps. For anyone asking how to care for guppy poecilia ret in pairs blue moscow guppies (1 male + female), fry management is often the only part that becomes more involved.

Common Breeding Challenges

The most common issues are too many males, lack of cover, poor fry feeding, and unstable water quality. Breeders trying to preserve line traits should separate fry by strain and avoid random crossing with other varieties such as koi, tuxedo, or Endler-type fish. That matters if you are aiming for consistent Moscow body colour.

Advanced Breeding Tip

If you want to strengthen Blue Moscow traits, grow out several batches separately and select the best-bodied males with the deepest full-body blue rather than choosing only by tail size. Strong colour across the shoulder and body is one of the defining features of a quality Moscow line.

Many hobbyists looking for fancy guppy for sale, fancy guppy for sale uk, fancy guppies uk, or best place to buy guppies online are really looking for fish that breed true and arrive in healthy condition. Starting with a strong Blue Moscow pair gives you a much better chance of success than mixing uncertain strains from multiple sources.

Blue Moscow Guppy vs Similar Species: Which Should You Choose?

There are many beautiful guppy fish types, so choosing the right one depends on your goal. Do you want a breeding pair, a bright display fish, a mixed community group, or a strain for selective line breeding? Blue Moscow guppies are best for aquarists who want a darker, more elegant look than the bright orange and yellow strains often seen in chain stores.

Feature Blue Moscow Fancy Guppy German Sunset Guppy
Max Size Up to 6 cm Up to 6 cm
Care Level Easy to moderate Easy
Temperature 22-28°C 22-28°C
Price £17.42 Varies by listing
Best For Elegant dark colour, breeding pairs Bright warm colours in community tanks
Feature Blue Moscow Fancy Guppy Endler Livebearer
Body Shape Broader, more ornamental Slimmer, more active
Colour Style Solid deep blue body Wild-type neon patches
Breeding Very easy Very easy
Best For Classic fancy strain keeping Smaller active livebearer groups
Notes Better for strain-focused displays Watch for hybridisation with guppies

If you are comparing this pair with koi guppies for sale, dragon guppies for sale, dumbo guppies for sale uk, or even ifga show guppies for sale, the Blue Moscow sits in a sweet spot. It is striking enough for display, practical enough for beginners, and stable enough for breeders. It is also a more distinctive option than the mixed stock often associated with searches like guppy fish price pets at home or mass-market fancy guppy price comparisons.

For related choices, compare this pair with the Guppy German Sunset Male, the Guppy Dumbo Ear Dragon Breeding Beautiful, or the Guppy Poecilia Ret in Pairs Panda. If you want a darker, cleaner body colour with strong breeding potential, Blue Moscow is often the better pick.

What Are the Common Health Problems in Blue Moscow Guppies and How Can You Prevent Them?

Healthy guppies are active, alert, and always interested in food. Their fins should be open, their swimming smooth, and their body shape even rather than pinched or bloated. When a Blue Moscow pair is thriving, the male shows strong colour and display behaviour while the female remains full-bodied and steady in movement.

Common Problems

The most common guppy issues are fin rot, white spot, wasting from internal parasites, shimmying caused by poor water conditions, and bacterial infections linked to stress. Fancy strains can also suffer if kept too cool, too soft, or in dirty water. Because guppies are often sold widely under searches like guppy fish for sale, fancy guppies for sale, and rare guppies for sale, quality can vary a lot between sources.

Treatment & Prevention

Prevention is always easier than cure. Maintain weekly water changes, avoid overfeeding, keep temperature stable, and quarantine new fish. If symptoms appear, move affected fish to a treatment tank where possible. Warm, clean, oxygen-rich water supports recovery. Use medications carefully and always identify the likely cause before treating.

⚠️ Health Warning

Never add medication blindly to a display tank without checking whether it is safe for snails, shrimp, or sensitive fish. Poor diagnosis often causes more losses than the original problem.

🔹 Quarantine Protocol

  • Use a separate heated tank for 2-4 weeks
  • Observe appetite, fins, faeces, and swimming behaviour daily
  • Test ammonia and nitrite regularly
  • Do small water changes to keep conditions stable
  • Only move fish to the display tank once fully settled and symptom-free

People often search rare guppies for sale uk or rare guppies for sale uk cheap, but lower price should never come before stable health. A properly conditioned pair is worth more than a cheaper fish that arrives stressed, thin, or incorrectly sexed.

What Is Blue Moscow Guppy Behaviour Like in the Aquarium?

Blue Moscow guppies are lively, social, and constantly on the move. They use all levels of the aquarium but spend much of their time in the middle and upper areas, especially around plants and feeding zones. This makes them ideal guppy poecilia ret in pairs blue moscow guppies (1 male + female) peaceful community fish for home aquariums.

Males display often, especially in front of females or rival males. This behaviour includes tail fanning, side flashing, and quick darting movements. Females are calmer and usually spend more time foraging. In a balanced group, this creates a lively but not chaotic tank.

They are also excellent beginner tropical fish UK keepers can learn from because their behaviour reflects tank conditions clearly. Clamped fins, hiding, surface gasping, or sudden inactivity are signs to check water quality. In contrast, active swimming, regular feeding, and open finnage are good indicators. For families considering guppy poecilia ret in pairs blue moscow guppies (1 male + female) tropical fish for kids, they are engaging to watch and easy to understand, provided an adult handles maintenance.

Why Buy Blue Moscow Fancy Guppies from Tropical Fish Co?

This Blue Moscow pair is selected for the traits keepers actually care about: clear sexing, strong body shape, healthy finnage, and the rich blue tone that makes Moscow guppies so desirable. That matters because not every fancy guppy uk listing offers a true, well-matched pair. A properly selected male and female give you a better display, a better breeding start, and fewer surprises when the fish settle in.

Before dispatch, fish are monitored for feeding response, swimming behaviour, and overall condition. We focus on sending active, settled specimens rather than freshly stressed imports. For customers searching live tropical fish delivery UK, livebearers for sale UK, fancy guppy for sale uk, or fancy guppies uk, careful packing matters just as much as the strain itself. Fish are packed in insulated boxes, with seasonal heat packs when needed, and sent using tracked delivery methods suitable for live fish.

Each order is prepared to reduce transport stress, and this is especially important with ornamental strains like Blue Moscow, where finnage and body condition are part of the appeal. If you are comparing fancy guppy fish price, fancy guppy price, or wondering about the difference between specialist stock and mass-market fish, the answer is usually visible in colour depth, body quality, and how quickly the fish settle after arrival.

Whether you want a display pair, a first breeding project, or a reliable start to a livebearer collection, this is a practical choice for aquarists looking for fancy guppies for sale with real strain value. Order your Blue Moscow pair with confidence and build a colourful, active aquarium around one of the hobby’s most proven livebearers.

Why Choose Tropical Fish Co for Blue Moscow Guppies

  • Matched male and female pair selected for Blue Moscow colour style and breeding potential
  • Fish observed for feeding response and condition before dispatch
  • Insulated live fish packing with tracked delivery suitable for UK transit

You Might Also Like

Build a stronger guppy setup with complementary strains and essentials. Add extra females with GUPPY FEMALE Lovely Fish to reduce male pressure in breeding groups. For another bold colour line, try the Green Moscow Guppy Male Lovely Fish. If you enjoy contrast, the Guppy Poecilia Ret in Pairs Panda offers a very different pattern style. For a brighter warm-toned display, the Guppy German Sunset Male is a classic choice. You can also explore our tropical fish food range for suitable micro foods and our aquarium filter collection for stable water quality in guppy tanks.